Revolving chair.



Patent JOHN ELLENBECKER, OF PORT WASI'IINGTON, ISCONSIN.

REVO'LVl-NG CHAIR.

srnorricn'rron forming part of Letters Patent No. 655,701, aa'zed August 14, leoo.

Application filed July Z, 1900. Serial No. 221252. (No model.)

T0 all whom it may conoer'n:

Be it known that I, J oHN ELLENBECKER, of Port Washington, in the county of Ozaukee and State of Wisconsin, have invented a new and useful Iinprovenient in Revolvin g Ohairs, of which the following is a description, reference being had to the accoxnpanying drawings, which are a part of this specification.

My invention relates to improved devices adapted for use with achair or stool to facilitate the raising or lowering of the seat and to permit of the rotation or swinging around of the seat in position freeiy without thereby in any manner raising or lowering` the seat.

The invention consists of the devices and their combinations, as herein described and clairned, or the equivalents thereof.

In the drawings, Figure 1 is a Vertical section of my iinproved devices to be employed in a revolving chair, adapted for raising and lowering the seat and for permitting the seat to be rotated without raising or lowering it. Fig. 2 is a top plan view of the nut turning on the spindle for raising and lowering the seat. Fig. 3 is a top plan view of the hub in which the spindle turns and which hub is supported by the legs of the chair. Figs. 4 and 5 are respectively a top plan view and a side elevation of a sleeve that fits about the spindle within the nut.

In the drawings, 6 is a hub which receives the inner ends of the legs of the chair in sockets therein and is secured to those legs and serves to support the chair-seat thereon by means of the devices hereinafter described. The hub 6 is provided with a central longitudinal bore cylindrical in form and of eqnal diameter throughout its length, in which the screw-thre'aded spindle 7 fits revolubly and adj ustable vertieally. This hub' 6 has radially-extending fianges 8 S at the top of the body of the hub, which fianges rest on the upper surfaces of the legs of the chair and are secured to those legs by means of screws through the apertures shown therefor. This hub is also provided with a tubular neck 9, extending upwardly from the body of the hub above the fianges 8. This neck 9 is provided with an annular groove 10, cut in its exterior surface medially, Asleeve 11, fitted loosely about the spindle 7, rests on the upper end of the neck 9. This sleeve is prefsize and thickness as the neck 9;

erably of substantially the sam'e diainetri'cal This sleeve 11 is provided with a longitudinally-disposed tongue 12, projeoting inwardly from its inner surface, which tongue enters and is slidable endwise 'in a longitudinal groove 13 in the spindle 7. The construction holds the sleeve 11 to rotation with the spindle 7, but perinits its movement freely longitudinally thereon.

` A nut 14 turns by its thread on the spindle 7 and is advisably provided With ahand-wheel 15 forconveniently rotatinfg the nut on the spin dle for raising or lowering the seat of the chair or stool. This nut 14 is elongated in the direction of the length of the spindle 7, and its.

axial bore is enlarged in the lower portion thereof, forming a chaniber adapted to re; ceive therein the sleeve 11 and the neck 9. The construction is such that the annular shoulder 16, formed at the lower end of the screw-thread in the nut 14 and at the upper end of the lower charnbered portion of the nut, rests on the top of the sleeve 11, and the peripheral wall of the chainber fits loosely about the sleeve and the neck. This construction perrnits of the free rotation. of the nut and the spindle on the top of the sleeve 11, whereby the seat of the chair or stool which is fixed on the spindle-head 17 may be ifreely rotated without its being raised or lowered.

Advisably a little boss 18 is formed on the under surface of the shoulder l6,which is adapted to entera slight recess or depression 19 in the top edge of the sleeve 11. This recess is formed with inclined walls, and the construction is adapted to secure the chairseat in position against too free revolution or against accidentally'or undesirably rotating, the resistance to such rotation ocourring by reason of the boss 18 entering the depression 19, being such only as to prevent such accidental or undesirable rotation of thefseat, while permitting its rotation freely under slightly-additional force applied thereto, directed to secure rotation of the chair-seat. A pin 20 through the wall of the ehaxnber of the nut 14 enters the groove 10 and prevents the removal of the spindle and the nut from the hub except by withdrawing the pin. The pin is advisably screw-threaded, so as to secure it releasably in place, and the groove 10 is of ICC such width vertically as to provide suffioient play of the pin 20 therein to permit of the boss 18 being raised onto the top of the sleeve 11 out of the depression 19.

What I olairn as my invention is- 1. A revoiving-seat iron, oomprising ahub provided with an upwardly-projeeting tubular neck, a sorew-threaded spindle rotatabie freeiy in the hub and its neok, a sleeve resting on said neok and provided With an interior tongue projeoting into a longitudinal groove in the spindle, and a'nut turning by its thread on the spindle above the 'sieeve and resting on'the sieeve and encircling saidl sleeve and said neek.

2. A revolving-seatiron, eoinprising a hub, a tubular neek projeeting above the body of the hub, the hub and neek having an axial eylindrieal bore of equai diameter throughout its 1ength,a screW-threaded spindle fitted and rotatable freely in the hub and provided with a longitudinal groove, a sieeve resting on the neok and provided with a tongue entering the'groovs'e in the spindle, a nut turning by its thread on the spindle and provided with an annular shoulder at the lower end of its thread which shoulder rests on the sleeve,

said nut also enoiroling said neok, and means seourin g the nut to the neek revoiubiy and releasably.

3. In combination, a Chair-hub provided with an upwardly-projeeting tubular neok, the neek having an annular exterior groove therein and the hub and neck having an axial o vlindrieai bore of equal diameter throughout its length, a sereW-threaded spindle provided With a longitudinai groove fitted and rotatable freely in the hub and its `neok, a sleeve resting on the neek and provided with a tongue projeeting freely into the groove in the spindle and having a depression in its upper edge, a nut turning by its thread on the spindle and resting on the sleeve and provided With a boss adapted to enter the depression in the sleeve, said nut being extended downwardly about the sleeve and the neck, anda pin through the wali of the nut entering the groove about the neok of the hub.

In testirnony Whereof I affix my signature in presence of two Witnesses.

JOHN ELLENB'ECKER.

Witnesses:

WILLIAM AHLHAUsER, P. GnAssER. 

